How to get around the limited canvas size (bug)

ee918144-bd34-400d-9048-264fff415ffb

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I do have problems with Canvas.

(Info: I know of the canvas bug! This bug is still not fixed yet )

But first, what am I doing ?

I am drawing huge signal functions which I want to see. I'm using a Scroll Pane in which a canvas is placed, which is as big as the signal function is in width and height. As result I can scroll to get at every position at the canvas.

That's the simplest solution to see the whole signal function drawed with great performance. But .. maybe some people can image. Those signal functions aren't as that small. They're around 2^18 in width and in worst case szenarios with a height of 5000 ?

So now, if those canvas are as that big I get a NullPointer Exception

And also I do not see where the Null Pointer Exception is generated.

See->

java.lang.NullPointerException

  at com.sun.javafx.sg.prism.NGCanvas$RenderBuf.validate(Unknown Source)

  at com.sun.javafx.sg.prism.NGCanvas.initCanvas(Unknown Source)

  at com.sun.javafx.sg.prism.NGCanvas.renderContent(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.doRender(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.render(Unknown Source)

  at com.sun.javafx.sg.prism.NGGroup.renderContent(Unknown Source)

  at com.sun.javafx.sg.prism.NGRegion.renderContent(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.doRender(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.render(Unknown Source)

  at com.sun.javafx.sg.prism.NGGroup.renderContent(Unknown Source)

  at com.sun.javafx.sg.prism.NGRegion.renderContent(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.renderForClip(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.renderRectClip(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.renderClip(Unknown Source)

  at com.sun.javafx.sg.prism.CacheFilter.impl_renderNodeToCache(Unknown Source)

  at com.sun.javafx.sg.prism.CacheFilter.render(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.renderCached(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.doRender(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.render(Unknown Source)

  at com.sun.javafx.sg.prism.NGGroup.renderContent(Unknown Source)

  at com.sun.javafx.sg.prism.NGRegion.renderContent(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.doRender(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.render(Unknown Source)

  at com.sun.javafx.sg.prism.NGGroup.renderContent(Unknown Source)

  at com.sun.javafx.sg.prism.NGRegion.renderContent(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.doRender(Unknown Source)

  at com.sun.javafx.sg.prism.NGNode.render(Unknown Source)

  at com.sun.javafx.tk.quantum.ViewPainter.doPaint(Unknown Source)

  at com.sun.javafx.tk.quantum.ViewPainter.paintImpl(Unknown Source)

  at com.sun.javafx.tk.quantum.PresentingPainter.run(Unknown Source)

  at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)

  at java.util.concurrent.FutureTask.runAndReset(Unknown Source)

  at com.sun.javafx.tk.RenderJob.run(Unknown Source)

  at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

  at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

  at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(Unknown Source)

  at java.lang.Thread.run(Unknown Source)

If the canvas is not as that big I do not have this problem.

Any suggestions to solve this problem ?

Aswell I have to ask, when this bug get's fixed.

Nachricht geändert durch ee918144-bd34-400d-9048-264fff415ffb

jsmith

If you think there is a bug to be fixed, check the existing bug system:

https://bugs.openjdk.java.net/secure/Dashboard.jspa

If the issue is not reported there, then log a bug report:

Report a Bug or Request a Feature

In the meantime, use a smaller canvas.